A History Professor Gives a Quiz to His Class and Records

Multiple Choice

A history professor gives a quiz to his class and records the following scores: 13, 11, 11, 9, 12, 13, 16, 14, 11, 10, 8, 13, 20. The mode(s) for this distribution is(are) _________.

A) 11
B) 13
C) 11 and 13
D) there is no mode